I hear that Ghost installations can't at this time have multiple users.

In that case, if you have a test site I can try out, I just want to make one post and edit it. I might want to come back a few times.

I promise I'll only modify the one post.

Update #2

Several people offered to let me use their installation, and I was able to create and edit a test post thanks to Christian Dadswell. The Ghost people added me to their beta platform, so I should be able to have my own blog soon, without having to set up an installation. Most important I was able to see how their blog post editor works, which is what I wanted to have a look at. I always look for prior art, no need to reinvent what already works.